11111321111 has 4 divisors (see below), whose sum is σ = 12121441224. Its totient is φ = 10101201000.

The previous prime is 11111321107. The next prime is 11111321129. The reversal of 11111321111 is 11112311111.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11111321111 - 2² = 11111321107 is a prime.

It is a super-2 number, since 2×11111321111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111321171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505060040 + ... + 505060061.

It is an arithmetic number, because the mean of its divisors is an integer number (3030360306).

Almost surely, 2^11111321111 is an apocalyptic number.

11111321111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11111321111 is a deficient number, since it is larger than the sum of its proper divisors (1010120113).

11111321111 is a wasteful number, since it uses less digits than its factorization.

11111321111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010120112.

The product of its digits is 6, while the sum is 14.

Adding to 11111321111 its reverse (11112311111), we get a palindrome (22223632222).

The spelling of 11111321111 in words is "eleven billion, one hundred eleven million, three hundred twenty-one thousand, one hundred eleven".